Do you see the difference? If people purchased the game with the understanding that a 72 hour early access before the release date (those dates that change all the time), then they could be understandably expecting that 72 hour to hold, even if the release date is moved up. If EA was advertised as including 72-hour early access before the normal buyers, then yes, it is false advertising if they changed it. Now, if they never mentioned 72 hour early access as part of the deal, then it's not false advertising, but just moving the release date doesn't make them exempt from promises.
That argument would make sense if they paid *more* for the 72 hours. But they didn't pay more, they just paid earlier. If they'd paid more, I could understand it would be reasonable feel like they paid extra for something they aren't getting. But they didn't pay more, they only paid earlier.